Exempt plates are issued to religious groups and other non-profit organizations.
The current series begins with YYE.

Note that these plates lack the state flag in the center. The center is usually
broken by a half-space.
The YYM prefix, however, sometimes lacks both the middle space and the
"EXEMPT" text at the bottom of the plate (see [YYM 951] below.) This is
a variation in manufacturing that was not requested by the DMV.

For the purposes of
this subsection, "charitable organization" means a nonprofit association, corporation, society, or other entity organized, incorporated, or headquartered in the state
for educational, cultural, scientific, or other charitable purposes, as prescribed in regulations of the department.